錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12; 錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
鈥?WIDE COMMON MODE RANGE 鈥?/div>
Includes negative supply
鈥?WIDE SUPPLY VOLTAGE RANGE
Single supply: 5V to 40V
Split supplies: 鹵2.5V to 鹵20V
鈥?HIGH EFFICIENCY 鈥?|Vs鈥?.2V| at 2.5A typ
鈥?HIGH OUTPUT CURRENT 鈥?3A
鈥?LOW DISTORTION
8-PIN TO-3
PACKAGE STYLE CE
錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12; 錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;
APPLICATIONS
鈥?HALF & FULL BRIDGE MOTOR DRIVERS
鈥?AUDIO POWER AMPLIFIER
STEREO 鈥?30W RMS per channel
BRIDGE 鈥?60W RMS per package
鈥?IDEAL FOR SINGLE SUPPLY SYSTEMS
5V 鈥?Peripherals, 12V 鈥?Automotive
28V 鈥?Avionic
錕?frac12;錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
FIGURE 1: BIDIRECTIONAL
SPEED CONTROL FROM A
SINGLE SUPPLY.
DESCRIPTION
The ampli鏗乪r design consists of dual monolithic input and output
stages to achieve the desired input and output characteristics
of the PA74 and PA76. The input stage utilizes a dual power op
amp on a single chip monolithic that drives the output stages.
The output stages are con鏗乬ured in a non inverting unity gain
buffer con鏗乬uration. The output stages of the ampli鏗乪r are also
compensated for stability. The PA74 and PA76 dual ampli鏗乪rs are
designed with both monolithic and hybrid technologies providing
a cost effective solution for applications requiring multiple ampli-
鏗乪rs per board or bridge mode con鏗乬urations. Both ampli鏗乪rs
are internally compensated but are not recommended for use
as unity gain followers.
This dual hybrid circuit utilizes a beryllia (BeO) substrate, thick
鏗乴m resistors, ceramic capacitors and monolithic ampli鏗乪rs to
maximize reliability and power handling capability, minimize size
and give top performance. Ultrasonically bonded aluminum wires
provide reliable interconnections at all operating temperatures.
The 8-Pin TO-3 package is hermetically sealed and electrically
isolated. The use of compressible isolation washers voids the
warranty.
TYPICAL APPLICATION
R1 and R2 set up ampli鏗乪r A in a non-inverting gain of 2.8.
Amp B is set up as a unity gain inverter driven from the output
of amp A. Note that amp B inverts signals about the reference
node, which is set at mid-supply (14V) by R5 and R6. When
the command input is 5V, the output of amp A is 14V. Since
this is equal to the reference node voltage, the output of amp
B is also 14V, resulting in 0V across the motor. Inputs more
positive than 5V result in motor current 鏗俹w from left to right
(see Figure 1). Inputs less positive than 5V drive the motor in
the opposite direction.
The ampli鏗乪rs are especially well-suited for this application.
The extended common mode range allows command inputs as
low as 0V. Its superior output swing abilities let it drive within
2V of supply at an output current of 2A. This means that a
command input that ranges from 0.714V to 9.286V will drive a
24V motor from full scale CCW to full scale CW at up to 鹵2A. A
single power op amp with an output swing capability of Vs 鈥?
would require 鹵30V supplies and would be required to swing
48V p-p at twice the speed to deliver an equivalent drive.
EQUIVALENT SCHEMATIC
ONE CHANNEL
錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;
EXTERNAL CONNECTIONS
(TOP VIEWS)
PA74
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
PA76
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
錕?frac12;
錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;錕?frac12;
APEX MICROTECHNOLOGY CORPORATION 鈥?TELEPHONE (520) 690-8600 鈥?FAX (520) 888-3329 鈥?ORDERS (520) 690-8601 鈥?EMAIL prodlit@apexmicrotech.com
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